San Francisco resident Henry Wolf is suing BMW, claiming the company?s bike gave him an unexpected, unwanted and ongoing erection lasting more than two years. Wolf specifically blames an after-market ridge-like seat mounted on his 1993 Beemer bike for causing an acute case of priapism ? a persistent, lasting erection ? according to a complaint filed in San Francisco?s state court.

The 52-year-old Wolf says a four-hour ride in 2010 left him with the condition and that he ?is now unable to engage in sexual activity, which is causing him substantial emotional and mental anguish.?

Wolf "has been experiencing continuing problems since his motorcycle ride," says his attorney, Vernon Bradley of Sausalito in the lawsuit, filed in California Superior Court in San Francisco last Thursday. "He is now unable to engage in sexual activity, which is causing him substantial emotional and mental anguish."

Wolf is also suing manufacturer Corbin-Pacific, who made the seat, and both BMW and Corbin for negligently assembling the seat. He also blames both companies for causing him emotional distress and that he has been experiencing ?continuing problems? since the 2010 bike ride.

Priapism, according to WebMD.com, is caused by a variety of conditions, such as:

Sickle cell anemia

Certain medications

Trauma to the spinal cord or genital area

Black widow spider bites

Carbon monoxide poisoning

Illicit drug use, including marijuana and cocaine.

Wolf is suing in excess of $25,000 for general negligence and liability, and is also seeking reimbursement for lost wages, hospital and medical expenses and ?general damage.?